as the title says i had 2x zlx15p+subs before and swapped to these, the best upgrade i have ever done, out of the box they dont sound any where as good as any ev product, even the zlx's, but paired with a dbx driverack and a bit of fine tuning and they can reproduce sound much cleaner and vibrant than than any of their competitors in my opinion, and they play hella loud, an entirely different world than the zlx's